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<html>
<head>
<link href='style.css' rel='stylesheet' type='text/css'>
<title>LeftValues Quiz</title>
<link rel="icon" type="image/png" href="icon.png">
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<body>
<script type="application/javascript"
        src="questions.js">
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<h1>LeftValues</h1>
<select id="langPicker"></select>
<hr>
<h2 data-i18n="quiz-loading" style="text-align:center;" id="question-number">Loading...</h2>
<p class="question" id="question-text"></p>
<button data-i18n="quiz-strongly-agree" class="button" onclick="next_question( 1.0)" style="background-color: #1b5e20;">Strongly Agree</button> <br>
<button data-i18n="quiz-agree" class="button" onclick="next_question( 0.5)" style="background-color: #4caf50;">Agree</button> <br>
<button data-i18n="quiz-neutral" class="button" onclick="next_question( 0.0)" style="background-color: #bbbbbb;">Neutral/Unsure</button> <br>
<button data-i18n="quiz-disagree" class="button" onclick="next_question(-0.5)" style="background-color: #f44336;">Disagree</button> <br>
<button data-i18n="quiz-strongly-disagree" class="button" onclick="next_question(-1.0)" style="background-color: #b71c1c;">Strongly Disagree</button> <br>
<button data-i18n="quiz-back" class="small_button" onclick="prev_question()" id="back_button">Back</button>
<button data-i18n="quiz-back" class="small_button_off" id="back_button_off">Back</button>
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<!-- JavaScript for the test itself -->
<script type="application/javascript" src="i18n.js"></script>
<script>
    var max_a, max_b, max_c, max_d, max_e, max_f, max_g// Max possible scores
    max_a = max_b = max_c = max_d = max_e = max_f = max_g = 0
    var a, b, c, d, e, f, g // User's scores
    a = b = c = d = e = f = g = 0
    var qn = 0 // Question number
    var prev_answer = null
    init_question();
    for (var i = 0; i < questions.length; i++) {
        max_a += Math.abs(questions[i].effect.a)
        max_b += Math.abs(questions[i].effect.b)
        max_c += Math.abs(questions[i].effect.c)
        max_d += Math.abs(questions[i].effect.d)
		max_e += Math.abs(questions[i].effect.e)
		max_f += Math.abs(questions[i].effect.f)
		max_g += Math.abs(questions[i].effect.g)
    }
    function init_question() {
        document.getElementById("question-text").innerHTML = (userLang in questions[qn].i18n) ? questions[qn].i18n[userLang] : questions[qn].question
        document.getElementById("question-number").innerHTML = i18n.getString("quiz-question-of", [qn, questions])
        if (prev_answer == null) {
            document.getElementById("back_button").style.display = 'none'
            document.getElementById("back_button_off").style.display = 'block'
        } else {
            document.getElementById("back_button").style.display = 'block'
            document.getElementById("back_button_off").style.display = 'none'
        }

    }

    function next_question(mult) {
        a += mult*questions[qn].effect.a
        b += mult*questions[qn].effect.b
        c += mult*questions[qn].effect.c
        d += mult*questions[qn].effect.d
		e += mult*questions[qn].effect.e
		f += mult*questions[qn].effect.f
		g += mult*questions[qn].effect.g
        qn++
        prev_answer = mult
        if (qn < questions.length) {
            init_question()
        } else {
            results()
        }
    }
    function prev_question() {
        if (prev_answer == null) {
            return
        }
        qn--
        a -= prev_answer * questions[qn].effect.a
        b -= prev_answer * questions[qn].effect.b
        c -= prev_answer * questions[qn].effect.c
        d -= prev_answer * questions[qn].effect.d
		e -= prev_answer * questions[qn].effect.e
		f -= prev_answer * questions[qn].effect.f
		g -= prev_answer * questions[qn].effect.g
        prev_answer = null
        init_question()

    }
    function calc_score(score,max) {
        return (100*(max+score)/(2*max)).toFixed(1)
    }
    function results() {
        location.href = `results.html`
            + `?a=${calc_score(a,max_a)}`
            + `&b=${calc_score(b,max_b)}`
            + `&c=${calc_score(c,max_c)}`
            + `&d=${calc_score(d,max_d)}`
			+ `&e=${calc_score(e,max_e)}`
			+ `&f=${calc_score(f,max_f)}`
			+ `&g=${calc_score(g,max_g)}`
    }
</script>
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